Author Affiliations
Abstract
1 College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
2 College of Physics, Huazhong Normal University, Wuhan 430079, China
A DC current sensor based on an optically pumped atomic magnetometer is proposed. It has a high linearity in a wide operation range, since the magnetometer measures the absolute magnitude of the magnetic field produced by the current to be measured. The current sensor exhibits a high accuracy with a non-moment solenoid and magnetic shielding to suppress the influence from the environment. The absolute error of the measured current is below 0.08 mA when the range is from 7.5 mA to 750 mA. The relative error is 5.54 × 10?5 at 750 mA.
current sensor atomic magnetometer high accuracy Chinese Optics Letters
2020, 18(3): 031202
华中科技大学材料科学与工程学院, 湖北 武汉 430074
铝锂合金是航空航天工业中最理想的轻质高强结构材料，为提高铝锂合金切割质量，采用1 kW 光纤激光器对2 mm 铝锂合金进行切割试验。初步探讨了离焦量、辅助气体压力、激光功率和切割速度对切割质量的影响，深入研究了连续激光模式与脉冲激光模式下的切割质量差异，结果表明脉冲模式下切缝挂渣少、粗糙度小。在此基础上，通过正交试验直观分析、方差分析、信噪比分析对工艺参数进行优化设计，最终获得良好的切割质量：挂渣厚度为0.087 mm，表面粗糙度为4.81 μm。
激光技术 光纤激光切割 工艺优化 方差分析 铝锂合金
针对激光切割加工工艺过程的复杂性、系统的非线性、以及加工参数变化而引起的时变性, 如何确定合适的工艺参数以得到良好的切割质量就显得极其重要。针对激光切割多种因素相关的非线性特点, 建立了人工神经网络模型, 并对激光切割工艺数据进行拟合, 从而实现切割质量的预测和优化工艺参数的选取, 用以指导实际切割过程。
激光切割 神经网络 预测系统 laser cutting neural network MATLAB MATLAB prediction system
